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A GridLayout is declared within an XML file using the <GridLayout> element tag. For example:

The number of rows and columns within the grid can be declared using the android:rowCount and android:columnCount properties. Typically, however, if the number of columns is declared the GridLayout will infer the number of rows based on the number of occupied cells making the use of the rowCount property unnecessary.
Similarly, the orientation of the GridLayout may optionally be defined via the android:orientation property. The following example XML declares a 2 x 2 GridLayout configuration in horizontal orientation:

Adding Child Views to the GridLayout
Child views can be added to a GridLayout by declaring the elements within the <GridLayout> structure in the XML file. If no row and column values are declared for a child it is positioned automatically by the GridLayout class based on the configuration of the layout and the position of the view in the XML file. The following XML places four buttons within the above GridLayout, with each view placed in the top left hand corner of the encapsulating cell:

 

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